Waterproof building material



Aug. 28, 1923.

R. G. BACHMAN WATERPROOF BUILDING MATERIAL [II/672W: Roy fifiaalmm z, 20M, m w% Filed July 31. 1922 v Patented Aug. 2, i923;

nor e. sectarian, or on'roeeo, rumors.

WATERPROOF BUILDING TERIAL.

I I Application filed July 31, 1922. Serial No. 578,770.

a proof 30 therethrough is effectually resisted.

7 good bond;

' as the description proceeds.

To all whom it may concern:

' Be it 'known that I, ROY Gr. BAGHMAN, a citizen ofthe United States, residing at "Chicago, in the county of Cook-and State of 5 Illinois,have invented certain new and useful Improvements in Waterproof Building Materials, of which the following is a specification. i i J The present invention relates to waterbuilding material. 'Ithas been common practice to treat sheet building material, such as strawboard, by

coating or saturating same With'fiuid waterproofing material. This practice is open to objection in instances where it is desirable 'to retain the capillary attraction of the building material, as, for example, where said" building material, is used as the base for plastic material, such as plaster or stucco.

One object of the present invention is to provide animproved'buildi'n'g material of the nature of paperboard or strawboard,'

said building material being of'a cellular nature whereby to be capableof a capillary attraction for securing a satisfactory bond between said cellular material and plaster or stucco, the building material having the advantage that the penetration of water A further object. is to idebdudin material of the nature of co which will effectually resist the ingress of water, but will retain the desirable feature of cap-illarv attraction so as to proyide a Other objects of the invention will appear 1 Referring to the drawings? one embodiment of and I r I Figure 2 illilstrates'a detail of construc .tion. v Y

Referring to the preferred manner in which the present' invention is carried out the present invention;

a layer of corrugated board, indicated by the numeral 10, is provided, which corrugated board is faced on its two sides by layers -.."1111,1 of flat board. The material of which f lthe members 10 and 11 are composed may pulpboardgi-strawboard, or similar mate- 'i'ial well' fknownrfor building purposes. In

actice' it will found advisable to have fastfon'e of the members 11 of cellular gated board, a

Figure 1 1s. a perspective viewlllustrating Each of the layers 11-11 is made up of plies of paper, straw, or other board, indi' cated by the numerals 12-12. The plies 1212 may be fasteiied together byme-ans of a waterproof adhesive 13, such as asphaltum. Or the waterproof material may be in- .corporated in said plies during the process of manufacture of the paper.

portion of the pores or cells of the plies Though a 12-12 is filled with waterproof inaterial, the outwardly facing surface of the layers ll11 should be free of said 'waterproof material in order that the capillary attraction thereof shall not be substantiallyflimpaired. Such'capillary attraction is useful in securing .the so-called suction when plas- 'well The numerals'l4l4 indicate strips of tape, applied around the entire outline of a strip of building material according to the present invention. Said tape may be waterproofed in any preferred way and may be attachedby means of any suitable adhesive.

It will be clear that the building material herein described resists ingress of water not only through the sides thereof, but through the side edges and ends thereof. The tape 14 has the added function of closing the .passageways along the corrugated member 10, thereby improving the sound proofing and the insulating properties of the material.

:M'any modifications of the present invention may occur to those skilled. in the art.

It is intended in this patent to cover all such modifications that come within the scope of the invention pended claims,

I claim: Y 1. Building material cpmprising corrugated board h-aving fiat layers applied to 'the two sides thereof, each of said layers comprising plies, said plies having operatively associated therewith waterproof material, the outermost of said plies havin a substantial part of the thickness thereof ree of said waterproof material, whereby the .of capillary vattraction thereof is as 'definedby the ap- 2; Building material comprising COIT lJI- of said Waterproof material, whereby the' property of capillary attraction thereof isretained.

aeeaee 4. Building material comprising a sheet of corrugated board faced on its' two sides with flatsheets, each of said fiat sheets comprising plies of which the outer consists of material having the property of capillary attraction, said plies having operatively associated therewith waterproof material,

said building material beingprovided with waterproof tape attached totits sideand end edges to prevent the ingress of water.

Si n'ed atChicago, Illinois, this 21st day of Jab 51922. 1 r

,ROY G. BACHZMAN. 

